FreeCAD

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/**************************************************************************\
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 * Copyright (c) Kongsberg Oil & Gas Technologies AS
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are
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 * met:
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 *
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 * Redistributions of source code must retain the above copyright notice,
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 * this list of conditions and the following disclaimer.
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 *
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 * Redistributions in binary form must reproduce the above copyright
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 * notice, this list of conditions and the following disclaimer in the
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 * documentation and/or other materials provided with the distribution.
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 *
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 * Neither the name of the copyright holder nor the names of its
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 * contributors may be used to endorse or promote products derived from
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 * this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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\**************************************************************************/
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/*
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  Adjust how QuarterWidget reacts to alt key events
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 */
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#include <QCoreApplication>
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#include <QFocusEvent>
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#include <QKeyEvent>
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#include "InteractionMode.h"
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#include "QuarterWidget.h"
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using namespace SIM::Coin3D::Quarter;
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InteractionMode::InteractionMode(QuarterWidget * quarterwidget)
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  : QObject(quarterwidget)
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{
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  this->quarterwidget = quarterwidget;
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  this->altkeydown = false;
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  this->prevcursor = QCursor();
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  this->prevnavstate =
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    this->quarterwidget->getSoEventManager()->getNavigationState();
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  this->isenabled = true;
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}
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InteractionMode::~InteractionMode()
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{
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}
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void
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InteractionMode::setEnabled(bool yes)
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{
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  this->isenabled = yes;
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}
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bool
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InteractionMode::enabled() const
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{
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  return this->isenabled;
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}
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void
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InteractionMode::setOn(bool on)
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{
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  if (!this->isenabled) {
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    return;
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  }
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  SoEventManager * eventmanager = this->quarterwidget->getSoEventManager();
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  if (on) {
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    this->altkeydown = true;
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    this->prevnavstate = eventmanager->getNavigationState();
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    this->prevcursor = this->quarterwidget->cursor();
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    this->quarterwidget->setCursor(this->quarterwidget->stateCursor("interact"));
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    eventmanager->setNavigationState(SoEventManager::NO_NAVIGATION);
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  } else {
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    this->altkeydown = false;
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    this->quarterwidget->setCursor(this->prevcursor);
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    eventmanager->setNavigationState(this->prevnavstate);
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  }
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}
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bool
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InteractionMode::on() const
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{
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  return this->altkeydown;
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}
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bool
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InteractionMode::eventFilter(QObject * obj, QEvent * event)
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{
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  if (!this->isenabled) {
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    return false;
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  }
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  assert(obj == this->quarterwidget);
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  switch (event->type()) {
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  case QEvent::KeyPress:
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    return this->keyPressEvent(dynamic_cast<QKeyEvent *>(event));
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  case QEvent::KeyRelease:
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    return this->keyReleaseEvent(dynamic_cast<QKeyEvent *>(event));
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  case QEvent::FocusOut:
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    return this->focusOutEvent(dynamic_cast<QFocusEvent *>(event));
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  default:
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    return QObject::eventFilter(obj, event);
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  }
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}
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/*
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  when alt is pressed, override navigation and allow scenegraph to
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  process events so draggers and manipulators works
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 */
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bool
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InteractionMode::keyPressEvent(QKeyEvent * event)
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{
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  if (!event ||
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      !(event->key() == Qt::Key_Alt) ||
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      !(event->modifiers() & Qt::AltModifier)) {
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    return false;
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  }
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  this->setOn(true);
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  return true;
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}
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bool
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InteractionMode::keyReleaseEvent(QKeyEvent * event)
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{
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  if (!event || !(event->key() == Qt::Key_Alt)) {
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    return false;
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  }
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  this->setOn(false);
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  return true;
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}
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/*
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  if we lose focus while alt is down, send an alt-release event
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 */
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bool
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InteractionMode::focusOutEvent(QFocusEvent * event)
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{
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  Q_UNUSED(event); 
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  if (this->altkeydown) {
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    QKeyEvent keyevent(QEvent::KeyRelease, Qt::Key_Alt, Qt::NoModifier);
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    return QCoreApplication::sendEvent(this->quarterwidget, &keyevent);
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  }
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  return false;
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}
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